Here's the issue in the game. It's visible almost always, specially under light sources like here, being in the hanger at night.

Here's how it looks looks in blender.


Also, I'm probably better off asking at some 3D modeling forum, but while I'm here, might as well ask. Why do I get this lines on a plain surface?


While if we look at XBS 95ATI model I can't see lines whatsoever and It seems very smooth.


I'm a new to modeling and would appreciate if someone pointed me a finger into the right direction with how to solve this issues. Thank you!